Subtract 81/9 from 25/2, Solve 12 1/2

Subtract 81/9 from 25/2

1^st number: 12 1/2, 2^nd number: 9 0/9

25/2 - 81/9 is 7/2.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 9 is 18

Next, find the equivalent fraction of both fractional numbers with denominator 18
For the 1st fraction, since 2 × 9 = 18,
25/2 = 25 × 9/2 × 9 = 225/18
Likewise, for the 2nd fraction, since 9 × 2 = 18,
81/9 = 81 × 2/9 × 2 = 162/18
Subtract the two like fractions:
225/18 - 162/18 = 225 - 162/18 = 63/18
After reducing the fraction, the answer is 7/2
In mixed form: 31/2

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